Roughing cutter



Feb. 9, 1937. R. F. MCCLENATHAN ROUGHING GUTTER Fild oct. so, .1934

Patented Feb. 9, 1937 t ROUGHING CUTTER Roy F. McClenathan, Erie, Pa., assignor to Lamac v Process Company, Erie, Pa., a corporation K Application October 30, 1934, Serial No. 750,745

4 Claims.

In the present invention I provide a roughing cutter used to remove flesh and roughen leather soles, shanks of welt and McKay shoes, and the bottom of turned shoes.

For carrying out objects of this invention I employ a cutter so formed that grooves are undercut in the leather at a slight angle and by rotating the cutter, while the leather is urged thereagainst, the grooves are opened to provide habitats for a cementitious substance; consequently, when pressure is applied to the leather a lock or bond is effected.

Another object of the invention is to provide a cutter capable of forming a multiplicity of definitely defined undercut grooves in the leather of sufficient depth to retain an appreciable quantity of the cement used for bonding the grooved leather to the surface to which it is secured on the shoe.

A further object of the invention is to provide a cutter which may be formed in one piece, or made in twin parts having a central bore adapted for the reception of a power shaft, the twin parts of the cutter being detachably engaged in a positive manner to in no way mitigate the edective operation of the cutter.

Other objects of the invention will be apparent from the following descrip-tion of the present preferred forms thereof, taken in connection with the accompanying drawing, wherein Fig. 1 is a sectional View of a cutter constructed in accordance with the present invention, showing the same mounted on a shaft;

Fig. 2 is a side elevational View thereof;

Fig. 3 is a detail enlarged, fragmentary longitudinal sectional view of the cutter;

Fig. 4 is an end elevation view of a modied form of cutter;

Fig. 5 is a longitudinal sectional view, taken on the line 5-5 of Fig. 4;

Fig. 6 is a perspective View of one of the cutter halves in the form of invention shown in Figs. 4 and 5 of the drawing; and

Fig. 7 is a detail fragmentary view of a piece of leather grooved with the cutter of the present invention.

It is desired, in the present invention, to employ a cutter which may be power operated and with which the leather may be engaged for grooving the latter in a specific manner. The contour and angularity of the grooves are defined by the shape of the periphery of the cutter. In the drawing, a power shaft 8 is illustrated fragmentarily, to which a cutter constructed in accordance with the present invention is detachably engaged. The cutter, which I have indicated at 9, consists of a cylindrical body provided with equi-distant longitudinally extending grooves I0. These grooves define peripheral ribs II, which are canted, as illustrated to advantage in Figs. 1 and 4. Each of the ribs I I is provided throughout its length with a series of teeth I2, the teeth being tapered and angularly disposed to lean in the direction of one end of the cutter. The teeth are of appreciable depth so that the corresponding groove made in the leather will be of complemental depth for a purpose more fully hereinafter set forth. The cylindrical cutter 9 is secured to the shaft 8 by a set screw I3 which, in the present instance, is shown to be arranged midway the ends of the cutter.

In Figs. 4, 5 and 6 of the drawing, I have shown a modified form of cutter which consists of two semi-cylindrical sections I4, the terminals I5 of which are extended to provide collars with which clamping bands I6 are engaged. The bands are detachably secured to the collars by means of set screws I1. It is of course, understood that in the form of invention shown in Figs. 4, 5, and 6, the construction of the ribs Il and teeth I2 is the same as that shown and described in the form of invention illustrated in Figs. 1 to 3, inclusive.

In Fig. 'l a portion of a leather sole is shown at I8, which is provided with a groove I9 cut by one of the teeth I2, showing to advantage the raised or proud flesh 20 bordering the groove I9. It is to be noted that the groove I9 is of course tapered complementing the shape of the teeth I2 and in addition, the groove is relatively wide in order to permit the introduction of a cementitious material thereinto. The raised flesh 20 is caused by the rotative action of the cutter with the present formation of ribs and teeth and is desirable to form a closure for the groove or fissure when pressure is applied to the sole.

In use of this device, the cutter is mounted on the shaft, as shown to advantage in Figs 1 and 2, and the sole or other piece of leather, urged against the periphery of the cutter. As the cutter moves across the sole, it cuts grooves thereinto, due to the characteristics of leather such as shown in Fig. 7, to provide the interstices desired for the accommodation of the cement preparatory to pressing the sole against the surface of the shoe with which it is to be placed in contiguity.

I have found after experiment, that the present construction of cutter embodying the particular arrangement of separate rows of teeth with the teeth disposed at a particular angularity pointing in one direction, is of the essence of importance in the present invention. The teeth are backed oli` in such a manner that the groove is Well opened by the rotative action of the cutter Without essentially weakening the leather, or impairing its eiiiciency in any Way.

It is of course, to be understood that various changes in the construction, proportion and arrangement of parts of the present invention may be made, within the scope of the appended claims.

What is claimed is:

1. A roughing cutter for forming grooves in shoe soles including a rotatable shaft equipped with a cutter cylinder, rows of teeth arranged at intervals around the cylinder, each tooth of each row being spaced from'the next adjacent tooth and bent toward one end of the cylinder.

2. A roughing cutter for shoe soles including cutter is rotated and to cause protrusion of the leather at one side of keach groove.

4. A device to roughen shoe soles including a toothed rotating member against which a shoe sole is adapted to be urged, the free ends of the teeth being tapered to a knife edge for cutting the leather, the teeth being canted to displace the leather subsequent to cutting the leather.

ROY F. MoCLENATI-IAN. 

